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https://github.com/SerenityOS/serenity
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efeb01e35f
This syscall only reads from the shared m_space field, but that field is only over written to by Process::attach_resources, before the process was initialized (aka, before syscalls can happen), by Process::finalize which is only called after all the process' threads have exited (aka, syscalls can not happen anymore), and by Process::do_exec which calls all other syscall-capable threads before doing so. Space's find_region_containing already holds its own lock, and as such there's no need to hold the big lock.
32 lines
994 B
C++
32 lines
994 B
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Memory/Region.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$get_stack_bounds(Userspace<FlatPtr*> user_stack_base, Userspace<size_t*> user_stack_size)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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auto& regs = Thread::current()->get_register_dump_from_stack();
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FlatPtr stack_pointer = regs.userspace_sp();
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auto* stack_region = address_space().find_region_containing(Memory::VirtualRange { VirtualAddress(stack_pointer), 1 });
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// The syscall handler should have killed us if we had an invalid stack pointer.
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VERIFY(stack_region);
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FlatPtr stack_base = stack_region->range().base().get();
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size_t stack_size = stack_region->size();
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if (!copy_to_user(user_stack_base, &stack_base))
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return EFAULT;
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if (!copy_to_user(user_stack_size, &stack_size))
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return EFAULT;
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return 0;
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}
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}
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